package org.linotte.imaginarium;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.Transparency;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.IOException;

import javax.swing.ImageIcon;

import org.linotte.frame.latoile.LaToile;
import org.linotte.moteur.outils.Ressources;

public class Outils {

	public BufferedImage toBufferedImage(Image image) {
		if (image instanceof BufferedImage) {
			return (BufferedImage) image;
		}

		// This code ensures that all the pixels in the image are loaded
		image = new ImageIcon(image).getImage();

		// Determine if the image has transparent pixels; for this method's
		// implementation, see Determining If an Image Has Transparent Pixels
		boolean hasAlpha = hasAlpha(image);

		// Create a buffered image with a format that's compatible with the screen
		BufferedImage bimage = null;
		GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
		try {
			// Determine the type of transparency of the new buffered image
			int transparency = Transparency.OPAQUE;
			if (hasAlpha) {
				transparency = Transparency.BITMASK;
			}

			// Create the buffered image
			GraphicsDevice gs = ge.getDefaultScreenDevice();
			GraphicsConfiguration gc = gs.getDefaultConfiguration();
			bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
		} catch (HeadlessException e) {
			// The system does not have a screen
		}

		if (bimage == null) {
			// Create a buffered image using the default color model
			int type = BufferedImage.TYPE_INT_RGB;
			if (hasAlpha) {
				type = BufferedImage.TYPE_INT_ARGB;
			}
			bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
		}

		// Copy image to buffered image
		Graphics g = bimage.createGraphics();

		// Paint the image onto the buffered image
		g.drawImage(image, 0, 0, null);
		g.dispose();

		return bimage;
	}

	// This method returns true if the specified image has transparent pixels
	private boolean hasAlpha(Image image) {
		// If buffered image, the color model is readily available
		if (image instanceof BufferedImage) {
			BufferedImage bimage = (BufferedImage) image;
			return bimage.getColorModel().hasAlpha();
		}

		// Use a pixel grabber to retrieve the image's color model;
		// grabbing a single pixel is usually sufficient
		PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
		try {
			pg.grabPixels();
		} catch (InterruptedException e) {
		}

		// Get the image's color model
		ColorModel cm = pg.getColorModel();
		return cm.hasAlpha();
	}

	public Image chargementImage(String fichier, LaToile toile) {
		Image image = Ressources.chargementImage(fichier);
		// On va attendre que l'image soit chargée.
		if (toile != null) {
			MediaTracker mediaTracker = new MediaTracker(toile.getPanelLaToile());
			mediaTracker.addImage(image, 0);
			try {
				mediaTracker.waitForID(0);
			} catch (InterruptedException e) {
			}
		}
		return image;
	}

	/**
	 * @return
	 */
	public BufferedImage algoNegatif(Image i) {
		//http://stackoverflow.com/questions/8662349/convert-negative-image-to-positive
		//http://www.exampledepot.com/egs/java.awt.image/image2buf.html
		BufferedImage bugImg = toBufferedImage(i);
		for (int x = 0; x < bugImg.getWidth(); x++) {
			for (int y = 0; y < bugImg.getHeight(); y++) {
				int rgba = bugImg.getRGB(x, y);
				Color col = new Color(rgba, true);
				col = new Color(255 - col.getRed(), 255 - col.getGreen(), 255 - col.getBlue());
				bugImg.setRGB(x, y, col.getRGB());
			}
		}
		return bugImg;
	}

	// If an image is on the system clipboard, this method returns it;
	// otherwise it returns null.
	// http://www.exampledepot.com/egs/java.awt.datatransfer/ToClipImg.html
	public Image getFromClipboard() {
		Toolkit toolkit = Toolkit.getDefaultToolkit();
		Clipboard clipboard = toolkit.getSystemClipboard();
		try {
			return (Image) clipboard.getData(DataFlavor.imageFlavor);
		} catch (UnsupportedFlavorException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

}
